Dear WIEN2k users, I am new to WIEN2k. I am using WIEN2k11.1. I follow the link below to calculate the value of U parameter. http://www.wien2k.at/reg_user/textbooks/Constraint_U.pdf But, i am not able to do so. A file is also attached in which case.inst, case_upcore.error and steps i am following. I will be very thankful to you all Regards Suhayb Ehsan